*{
  padding: 0;
  margin: 0;
}
li{
  list-style-type: none;
}

button{
  border: none;
  outline: none;
}
img{
  display: block;
}
a{
  color: #606266;
  text-decoration: none;
  &:hover{
    color: #409eff;
    text-decoration: none;
    cursor: pointer;
  }
}
code{
  display: block;
  padding: 20px;
}